| Zhangli (Climatology) Directed by Prof. Qilong Miao, Xiaoke Wang and Zhiyun OuyangThe increasing of photo-chemical smog and ozone concentration has directly threaten the human's living environment. As one important predecessor of photo-chemical smog and ozone, non-methane hydrocarbon's (NMHC) emission is paid great attention. Isoprene is one kind of important NMHC, and also the most abundant volatile organic compound releases from vegetation in troposphere. Its emission accounts for half of the hydrocarbons' total one, and especially is very high in the rural and well vegetated areas, which greatly influences the regional environment such as ozone concentration.Based on literature review of isoprene emission, the preponderant species' emissions in Yangtze Delta were observed by enclosure sampling method and GC-PID (Gas Chromatograph Photo-ionization Detector). Isoprene emission factors of 40 species were detected, and Guenther's model, which had been used to estimate isoprene emission, was also validated. Coupling with other's measurements and the national forest census data, isoprene emission of the main forest tree species of China were estimated about 0.03-8.6Tg/yr with Guenther's model and then the temporal and spatial distribution characters were analyzed, which are expected to provide the basis for deeper understanding atmospheric environment change process, improving the results of atmospheric pollution model, and making more effective measure to control the pollution's emission to ecosystem and human living environment.
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